Home / 1,151.28-1,726.56-420.48

Finding the Fourth Proportional to 1,151.28, 1,726.56 and 420.48

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Solution

The fourth proportional to 1,151.28, 1,726.56 and 420.48 is: 630.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.28 : 1,726.56 = 420.48 : x
  2. Step 2: Convert to fraction form
    1,151.28/1,726.56 = 420.48/x
  3. Step 3: Cross multiply
    1,151.28x = 1,726.56 × 420.48
  4. Step 4: Simplify right side
    1,151.28x = 725,983.95
  5. Step 5: Solve for x
    x = 725,983.95/1,151.28
  6. Step 6: Final answer
    x = 630.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.